/usr/lib/x86_64-linux-gnu/libparistraceroute-0.9.so.1 is in libparistraceroute1 0.93+git20160927-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libparistraceroute-0.9.so.1.0.0